Time is a linear concept created by mankind to explain why we age. Our cognitive thinking abilities are only able to grasp a little, so the conept of time was created in order for us to manage our time alive. Time doesn't really exist, at least not linearly. Everything will stop and start again in the endless cycle of existence. Once our human race is extinct, another one will begin somewhere else in the infinite expanse of the multiverse. Hell, there's probably a race somewhere out there that is exactly like ours in every single way. With infinite space comes infinite possibilities, all of which occur.